过去从未死去，它甚至还没有过去。
行为恭敬，待人宽厚，处事平和，心意正直，学圣贤之道，选择良友以求有益身心，改进缺点以求完满。
Sustainable forestry isn't a cost—it's an investment in our future.
We've learned that change is necessary for growth.
阅读的行为是一种反叛的形式。
We must be free not because we claim freedom, but because we practice it.
P与NP问题是计算机科学中最重要的未解决问题之一。